#include <fstream>
#define lmax 1001

using namespace std;

ifstream f("matrix.in");
ofstream g("matrix.out");

bool ok;
char c;
char a[lmax][lmax];

int i,j,k,n,m,nr;
int v[27];
int b[lmax][lmax],bun[lmax][lmax];

int main()
{
    f>>n>>m;

    for (i=1;i<=n;i++)
      for (j=1;j<=n;j++)
        f>>a[i][j];



    for (i=1;i<=m;i++)
     for (j=1;j<=m;j++)
       {
           f>>c;
           v[c-96]++;
       }

   for (k=1;k<=26;k++)
    for (i=1;i<=n;i++)
     for (j=1;j<=n;j++)
      {
          b[i][j]=b[i-1][j]+b[i][j-1]-b[i-1][j-1];

          if (a[i][j]==k+96)
           b[i][j]++;

          if (i>=m && j>=m)
           if (b[i][j]-b[i-m][j]-b[i][j-m]+b[i-m][j-m]!=v[k])
            bun[i][j]=1;
      }

      for (i=m;i<=n;i++)
       for (j=m;j<=n;j++)
        if (!bun[i][j])
          nr++;

      g<<nr;

    f.close();
    g.close();
}